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Jotne
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Help with filter Rate Limit

Wed Jul 24, 2019 1:55 pm

I am trying to setup some security against some of my ports and have trouble tun understand and find information regarding rate limit.

When I setup return for some packets in Dst. Limit for a Filter Rule I have following values to set.
Rate:
Burst:
Limit By:
Expire:

The one I am sure about is Limit By: src. address. This will limit individual src ip in separat groups.
Eks setup
Rate: 4/min
Burst: 4
Limit By: src.ip
Expire: 120


When I this setting I can test my port 6 times before it block the 7 times in row.

What is different from Rate/Burst and what does minutes in Rates have to do with Expire?

What If I like to have max 4 retry within 2 hour. How to set it up?

Edit:
Is there any way to debug this? How to see how many IP there are in holde queue and how long they have been there?

Edit2:
Whit this setup:
Rate: 0/min
Burst: 4
Limit By: src.ip
Expire: 30

I can still try 6 times in row, before 7. is blocked.
 
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sebastia
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Re: Help with filter Rate Limit

Wed Jul 24, 2019 2:55 pm

Hey

Doc: https://wiki.mikrotik.com/wiki/Manual:I ... Properties
Matches packets up to a limited rate (packet rate or bit rate). Rule using this matcher will match until this limit is reached. Parameters are written in following format: count[/time],burst:mode.
count - packet or bit count per time interval to match
time - specifies the time interval in which the packet or bit count cannot be exceeded (optional, 1s will be used if not specified)
burst - initial number of packets or bits to match: this number gets recharged every 10ms so burst should be at least 1/100 of rate per second
mode - packet or bit mode
burst: bucket of saved-up tokens allowing to go over the hard limit set by count+time.

What If I like to have max 4 retry within 2 hour. How to set it up?
count=4
burst=0
time=7200

Don't know about the debug facilities.
 
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Jotne
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Re: Help with filter Rate Limit

Wed Jul 24, 2019 5:13 pm

Where do I find count?

I have for Dst-Limit:
Rate:
Burst:
Limit By:
Expire:


If the link above is the manual for dst-limit, it does not match field name I do see in winbox
 
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sebastia
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Re: Help with filter Rate Limit

Wed Jul 24, 2019 6:16 pm

The above is for "limit" condition. dst-limit is a special case of that one.
 
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Jotne
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Re: Help with filter Rate Limit

Wed Jul 24, 2019 6:34 pm

Limit has:
Rate
Burst
Mode

I do need to handel each source by it self, not all in once, since it will add a user who tries to hack to a black list.
Dst-Limit has Src.address.

Do any know of a good example and explanation on how rate limit works in RouterOS?
Rate.jpg
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sebastia
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Re: Help with filter Rate Limit

Wed Jul 24, 2019 8:58 pm

The nomenclature of winbox is different then their wiki: rate (winbox) = count (wiki)

The rate limiting logic is functionality provided by iptables of the underlying linux.
Just search for: "rate limit linux firewall" -> https://making.pusher.com/per-ip-rate-l ... -iptables/
 
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Jotne
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Re: Help with filter Rate Limit

Wed Jul 24, 2019 9:19 pm

Ahh, did not think about that. Will read through the nice documentation.

MT should rename the documentation or Winbox to make it mot clear what is what.
Using different name on the configuration in various location makes a mess :)
 
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